Method size

cpp/src/arrow/util/hashing.h:751–753

The number of entries in the memo table (which is also 1 + the largest memo index)

  // The number of entries in the memo table
  // (which is also 1 + the largest memo index)
  int32_t size() const override {
    return static_cast<int32_t>(hash_table_.size() + (GetNull() != kKeyNotFound));
  }

  int64_t values_size() const { return binary_builder_.value_data_length(); }